'86 exhaust on '85 car make a diff?

was looking at flowmaster at exhaust systems and couldnt find an 85. would 86 be that much of a difference?

1986 - 1991 Camaro / Firebird $586.47

was looking at flowmaster at exhaust systems and couldnt find an 85. would 86 be that much of a difference?

1986 - 1991 Camaro / Firebird $586.47
The 85 used a 4 bolt cat converter and the 86 used a 2 bolt.